Speaking to reporters at the White House, Trump promised that the administration would allow E15 fuel — a gasoline mixture that's 15 percent ethanol — to be sold year-round.

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It's a topic that rises nearly every summer, when EPA regulations mandate gas stations to swap out gasoline mixes with higher levels of ethanol for lower levels in order to comply with Environmental Protection Agency regulations that limit ground-level ozone. Current policies limit the sale of E15 in summer months because in warmer termperatures ethanol increases the amount of ground-level ozone.

"We’re going to raise it up to 15 percent and raise it to a 12-month period," Trump said.

Trump's comments to lift the federal limit were quickly hailed by biofuels groups that have long advocated for the policy change.

“We applaud President Trump for embracing a common-sense fix to create a level playing field for cleaner, more affordable fuel options during the summer driving season," said Growth Energy CEO Emily Skor in a statement. "The White House clearly understands that RVP relief will expand a growing market for America’s farmers while letting consumers pick the fuel of their choice. This simple fix allows retailers to offer better options alongside traditional blends all year long."

Trump's comments come as the administration is also weighing whether to change the Renewable Fuel Standard (RFS), which mandates refiners to blend certain amounts of ethanol and other biofuels into their fossil fuels or buy renewable fuel credits on an open market. Biofuel companies support maintaining it as is, while oil and gas companies argue current standards are hurting their bottom line.

Trump's comments Thursday have ethanol groups hoping that he will also support their side of the RFS debate.

“Refiners have held E15 hostage for years, and they always want more," said Brooke Coleman, executive director of the Advanced Biofuels Business Council. "For this to help farm families, it will be important that the White House continues to steer clear of refiner-backed changes that would gut the RFS."

Earlier today Trump held a roundtable talk on agriculture with Governors and members of Congress at the White House.